A low temperature butterfly valve operated by an extension rod

Abstract

This utility model discloses a cryogenic butterfly valve operated by an extended rod, including a valve body, a butterfly plate, a valve stem, and a power unit. The power unit drives the valve stem to rotate the butterfly plate relative to the valve body, opening and closing the medium flow channel inside the valve body. An extended sleeve is connected to the upper end of the valve stem, and an extended rod is connected to the power unit. The end of the extended rod opposite to the valve stem has a circumferential linkage structure. The extended rod is inserted into the extended sleeve, and a sliding groove is provided on the inner side of the extended sleeve. A slider matching the sliding groove is provided on the outer side of the extended rod. In use, the cryogenic butterfly valve of this utility model achieves circumferential linkage between the extended rod and the valve stem to control the rotation of the butterfly plate. When not in use, it can be raised along the axial groove of the sliding groove, so that the valve stem and the extended rod are separated, thereby reducing or avoiding heat conduction. It achieves circumferential linkage installation only when in use, avoiding the problem of long-term influence of the temperature of the medium in the pipeline on the power unit, and also reducing operational risks.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, specifically to a cryogenic butterfly valve operated with an extended rod. Background Technology

[0002] As is well known, a butterfly valve, also called a flap valve, is a simple regulating valve that can be used to control the opening and closing of low-pressure pipeline media. A butterfly valve is a valve in which the closing element (valve disc or butterfly plate) is a disc that rotates around the valve shaft to achieve opening and closing. It can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metals and radioactive media. When the installation location is in a foundation pit, deep well or in a confined space, an extended stem butterfly valve is often installed to facilitate faster operation of the butterfly valve by the staff.

[0003] This type of extended stem butterfly valve is not only suitable for environments where the physical extension remains unchanged, but it is also used in pipelines transporting high-temperature or low-temperature media. The extended stem not only prevents operators from getting close to the pipeline, but also reduces the impact of high or low temperatures conducted by the media on the power unit. Existing extended stem butterfly valves are generally configured with an extended stem connected to the main valve stem, and the end of the extended stem is fixed to the power unit. When the valve needs to be opened or closed, the power unit can be directly controlled. However, because the valve stem is directly connected to the butterfly plate and the extended stem is directly connected to the valve stem, even with some thermal insulation structures, the temperature-based power unit is still affected by the temperature of the media in the long term. Utility Model Content

[0004] In view of the prior art, the purpose of this utility model is to provide an extended rod design with a clutch structure, which allows the connecting rod on the power unit side to automatically disengage from the valve stem, isolating it from the valve at temperature during non-operation time, and enabling rapid linkage for safe operation of the cryogenic valve when needed.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a cryogenic butterfly valve operated by an extended rod, comprising a valve body, a butterfly plate, a valve stem, and a power unit. The power unit drives the valve stem to rotate the butterfly plate relative to the valve body to open and close the medium flow channel inside the valve body. An extended sleeve is connected to the upper end of the valve stem. An extended rod is connected to the power unit. The end of the extended rod opposite to the valve stem is provided with a circumferential linkage structure. The extended rod is inserted into the extended sleeve. A sliding groove is also provided on the inner side of the extended sleeve. A slider matching the sliding groove is provided on the outer side of the extended rod.

[0006] As a further feature of the above solution, the slide includes a circumferential groove and at least two axial grooves. The number of sliders is set to correspond to the number of axial grooves. When the slider slides in the circumferential groove to be directly opposite the axial groove, the extended rod moves axially and extends relative to the extended sleeve.

[0007] As a further feature of the above solution, the sliding groove and the axial groove are located in the positioning part inside the extended sleeve, and the positioning part is also provided with a movable part with an inner diameter smaller than that of the positioning part on the side near the valve stem.

[0008] As a further feature of the above scheme, the axial groove extends through the circumferential groove and connects to the upper end face of the extended sleeve. The slider can be disengaged from the extended sleeve along the axial groove. The axial groove is also provided with a guide slope.

[0009] As a further feature of the above solution, the extended sleeve includes a semi-annular sleeve plate and a fixing bolt. The valve stem is provided with a flat groove. The two semi-annular sleeve plates are fixed into a ring shape by the fixing bolt, and the lower end of the semi-annular sleeve plate is provided with an inner concave part that fits into the flat groove for circumferential fixation.

[0010] As a further feature of the above solution, the end of the extended rod is provided with a groove, and the upper end of the valve stem is provided with a matching slot. The slot and the groove are matched and circumferentially linked and engaged, and the engagement angle between the two is fixed and unique.

[0011] Beneficial effects: In use, the cryogenic butterfly valve of this utility model uses an extended rod to circumferentially link with the valve stem. The butterfly plate is rotated by the handwheel drive of the power unit. When not in use, it can be raised along the axial groove of the slide groove and then rotated circumferentially into the circumferential groove, so that the valve stem and the extended rod are separated. Furthermore, it can be rotated from the circumferential groove to the upper axial groove, so that the extended rod is completely separated from the valve stem and can be removed, thus completely avoiding heat conduction. Only when in use, the slide groove achieves circumferential linkage installation through the cooperation of the slot and the groove, thereby avoiding the problem of the temperature of the medium in the pipeline affecting the power unit for a long time and reducing the operational risk. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the butterfly valve structure of this utility model.

[0013] Figure 2 This is a schematic diagram of the cross-sectional structure of the butterfly valve in this embodiment.

[0014] Figure 3 This is a schematic diagram of the extended sleeve structure in this embodiment.

[0015] Figure 4 This is a cross-sectional schematic diagram of the valve stem extension connection structure in this embodiment.

[0016] Figure 5This is a schematic diagram of the semi-annular sleeve structure in this embodiment.

[0017] Reference numerals: 1. Valve body; 2. Butterfly plate; 3. Valve stem; 31. Flat groove; 32. Slot; 4. Extended sleeve; 41. Sliding groove; 42. Axial groove; 43. Circumferential groove; 44. Inner recess; 45. Semi-annular sleeve plate; 46. Fixing bolt; 47. Positioning part; 48. Moving part; 49. Guide slope; 5. Extended rod; 51. Sliding block; 52. Embedded groove; 6. Medium flow channel; 8. Power unit. Detailed Implementation

[0018] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, where there is no conflict, the embodiments and features described in these embodiments can be combined with each other.

[0019] like Figure 1-5 The illustrated cryogenic butterfly valve with extended rod operation includes a valve body 1, a butterfly plate 2, a valve stem 3, and a power unit 8. The power unit 8 drives the valve stem 3 to rotate the butterfly plate 2 relative to the valve body 1, opening and closing the medium flow channel 6 inside the valve body 1. An extended sleeve 4 is connected to the upper end of the valve stem 3. An extended rod 5 is connected to the power unit 8. The end of the extended rod 5 opposite to the valve stem 3 is provided with a circumferential linkage structure. The extended rod 5 is inserted into the extended sleeve 4. A sliding groove 41 is also provided on the inner side of the extended sleeve 4. A slider 51 matching the sliding groove 41 is provided on the outer side of the extended rod 5.

[0020] As described above, the butterfly valve in this embodiment features a detachable and adjustable extended rod 5, which allows the power unit 8, which is accessible to the operator, to be isolated or disassembled from the valve body 1 and valve stem 3 when the butterfly plate 2 is not being operated. This design achieves two objectives: firstly, the power unit 8 can avoid long-term exposure to the special media (low or high temperature) flowing within the medium channel 6 of the valve body 1; secondly, the extended rod 5 can be connected during operation, thus preventing the handwheel of the manually operated power unit 8 from being affected by low or high temperatures and avoiding the risk of insufficient protective equipment for operators, thereby improving the operational safety of butterfly valves used with extreme temperature media.

[0021] As a further provision of the above scheme, the slide groove 41 includes a circumferential groove 43 and at least two axial grooves 42. The slider 51 is configured to correspond to the number of axial grooves 42. When the slider 51 slides in the circumferential groove 43 and is directly opposite the axial groove 42, the extended rod 5 moves axially and extends relative to the extended sleeve 4.

[0022] With the above-described structural configuration, the upper part of the extended rod 5 in this embodiment can be adjusted by the position of the slider 51 within the slide groove 41, allowing it to stay in the circumferential groove 43 or to continue disassembling along the axial groove 42 and completely detach, depending on the usage requirements and circumstances.

[0023] It is worth noting that the extended sleeve 4 in this embodiment can be made of a material with low thermal conductivity and a certain strength. For example, rigid polyurethane can be used as the sleeve material. The strength and low thermal conductivity can basically meet the operating conditions in the range of -150℃ to 100℃. In this way, when the slider 51 is located in the circumferential groove 43, the temperature conduction will be relatively low, so that the equipment above will be less affected.

[0024] As a further provision of the above scheme, the sliding groove 41 and the axial groove 42 are located in the positioning part 47 inside the extended sleeve 4, and the positioning part 47 is also provided with a movable part 48 with an inner diameter smaller than that of the positioning part 47 on the side near the valve stem 3.

[0025] As a further feature of the above scheme, the axial groove 42 extends through the circumferential groove 43 and connects to the upper end face of the extended sleeve 4. The slider 51 can be disengaged from the extended sleeve 4 along the axial groove 42. The axial groove 42 is also provided with a guide slope 49.

[0026] As a further feature of the above solution, the extended sleeve 4 includes a semi-annular sleeve piece 45 and a fixing bolt 46. The valve stem 3 is provided with a flat groove 31. The two semi-annular sleeve pieces 45 are fixed into a ring shape by the fixing bolt 46. The lower end of the semi-annular sleeve piece 45 is provided with an inner concave part 44 that fits into the flat groove 31 for circumferential fixation. The purpose of the inner concave part 44 and the flat groove 31 is to prevent the extended sleeve 4 from disengaging from the valve stem 3 and from rotating relative to the valve stem 3.

[0027] As a further feature of the above scheme, the end of the extended rod 5 is provided with a groove 52, and the upper end of the valve stem 3 is provided with a matching slot 32 in the groove 52. The slot 32 and the groove 52 are matched and circumferentially linked and engaged, and the engagement angle between the two is fixed and unique.

[0028] The purpose of the aforementioned slots 32 and 52 is to allow the extended rod 5 and valve stem 3 to move in a circumferential direction after axial extension and contraction, and as... Figure 4 As shown, the engagement of the slot 32 and the groove 52 has only one angle. The purpose is to keep the rotation angle between the extended rod 5 and the valve stem 3 consistent after disassembly and reassembly. In this way, even if the operator is far away from the valve, he can know the current opening and closing angle of the butterfly plate 2 through the indicator on the power unit 8.

[0029] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of this utility model and its equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A cryogenic butterfly valve operated with an extended rod, comprising a valve body (1), a butterfly plate (2), a valve stem (3), and a power unit (8), wherein the power unit (8) drives the valve stem (3) to rotate the butterfly plate (2) relative to the valve body (1) to open and close the medium flow channel (6) within the valve body (1), characterized in that: The upper end of the valve stem (3) is connected to an extended sleeve (4), and the power unit (8) is connected to an extended rod (5). The end of the extended rod (5) opposite to the valve stem (3) is provided with a circumferential linkage structure. The extended rod (5) is inserted into the extended sleeve (4). The inner side of the extended sleeve (4) is also provided with a sliding groove (41), and the outer side of the extended rod (5) is provided with a slider (51) that matches the sliding groove (41).

2. The cryogenic butterfly valve with an extended rod operation according to claim 1, characterized in that: The slide (41) includes a circumferential groove (43) and at least two axial grooves (42). The slider (51) is set in a number corresponding to the axial grooves (42). When the slider (51) slides in the circumferential groove (43) to face the axial groove (42), the extended rod (5) moves axially and extends relative to the extended sleeve (4).

3. The cryogenic butterfly valve with an extended rod operation according to claim 2, characterized in that: The groove (41) and axial groove (42) are located in the positioning part (47) inside the extended sleeve (4). The positioning part (47) near the valve stem (3) is also provided with an active part (48) with an inner diameter smaller than that of the positioning part (47).

4. A cryogenic butterfly valve with an extended rod operation according to claim 2, characterized in that: The axial groove (42) extends through the circumferential groove (43) and connects to the upper end face of the extended sleeve (4). The slider (51) can be disengaged from the extended sleeve (4) along the axial groove (42). The axial groove (42) is also provided with a guide slope (49).

5. A cryogenic butterfly valve with an extended rod operation according to claim 1, characterized in that: The extended sleeve (4) includes a semi-ring sleeve piece (45) and a fixing bolt (46). The valve stem (3) is provided with a flat groove (31). The two semi-ring sleeve pieces (45) are fixed into a ring shape by the fixing bolt (46), and the lower end of the semi-ring sleeve piece (45) is provided with an inner concave part (44) that corresponds to the flat groove (31) and is circumferentially fixed.

6. A cryogenic butterfly valve with an extended rod operation according to claim 1, characterized in that: The extended rod (5) has a groove (52) at its end, and the upper end of the valve stem (3) has a matching slot (32) in the groove (52). The slot (32) and the groove (52) are matched and linked in a circumferential linkage, and the locking angle between them is fixed and unique.

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